CN109465308B - Mold with roller for rotationally extruding inner ribs and forming method of mold - Google Patents

Mold with roller for rotationally extruding inner ribs and forming method of mold Download PDF

Info

Publication number
CN109465308B
CN109465308B CN201811627664.5A CN201811627664A CN109465308B CN 109465308 B CN109465308 B CN 109465308B CN 201811627664 A CN201811627664 A CN 201811627664A CN 109465308 B CN109465308 B CN 109465308B
Authority
CN
China
Prior art keywords
die
lining
female die
rib
roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201811627664.5A
Other languages
Chinese (zh)
Other versions
CN109465308A (en
Inventor
李国俊
吴昂
寇鑫
赵熹
张治民
王强
李旭斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
North University of China
Original Assignee
North University of China
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by North University of China filed Critical North University of China
Priority to CN201811627664.5A priority Critical patent/CN109465308B/en
Publication of CN109465308A publication Critical patent/CN109465308A/en
Application granted granted Critical
Publication of CN109465308B publication Critical patent/CN109465308B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C25/00Profiling tools for metal extruding
    • B21C25/02Dies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/02Making uncoated products

Abstract

The invention relates to a die with a roller for rotationally extruding an inner rib and a forming method thereof. The technical scheme of the invention is as follows: the utility model provides a take mould of crowded interior muscle of gyro wheel soon, its includes components of a whole that can function independently terrace die, last die, key, lower die, revolving stage, tray, psammitolite inside lining and steel ring inside lining, the tray is established in the bottom of die down and is passed through the sliding key hookup with the revolving stage, the bottom surface and the revolving stage of die are connected down, it is connected with lower die through the bolt to go up the die, the psammitolite inside lining dress is in the inner chamber of the good toper section of thick bamboo base of extruding, the steel ring inside lining is established at the periphery of psammitolite inside lining up end, components of a. The molding steps are as follows: the mold with the roller rotary extrusion inner rib is arranged on the rotary extrusion machine to enable the rotary table to be connected with an extrusion rotary power system of the rotary extrusion machine, then the cone blank is placed into the inner cavities of the upper female mold and the lower female mold, the sand core lining and the steel body lining are sequentially placed into the inner cavity of the cone blank, the split male mold descends to the groove-shaped position of the inner wall of the cylinder body in a combined state, and the rotary roller rolls for molding.

Description

Mold with roller for rotationally extruding inner ribs and forming method of mold
Technical Field
The invention relates to a die with a roller for rotationally extruding an inner rib and a forming method thereof, belonging to the technical field of a rib forming device and a forming method for the inner wall of a cylindrical part.
Background
The large-sized cylindrical part is widely applied to the fields of navigation, aerospace, military and the like. The forming of the inner ring ribs on the inner wall of the large-sized cylindrical part is the technical bottleneck of plastic forming of the large-sized cylindrical part.
The inner ribs of the traditional large-sized cylindrical parts are generally manufactured by welding or integrally casting, the inner ribs formed by the two rib forming methods have too low pressure resistance, cannot bear large load and cannot meet the performance requirement of high fatigue, the performance of the inner ribs is required to be improved, a large workpiece and the inner ribs are integrally formed by adopting a forging method, but the bottleneck problem of the traditional method for forging the inner ribs is that the inner ribs are difficult to demould after forging.
In order to solve the difficult problem of difficult demoulding after forging, Chinese patent ZL201410764746.X discloses an 'inner transverse rib extrusion die for a cylindrical part', the die comprises an upper die base, a wedge block, a left convex die, a right convex die, a concave die, a limiter, a lower die base and a rotating device, wherein the left convex die and the right convex die are respectively arranged on the upper die base through a left convex die fixing plate and a right convex die fixing plate, the concave die is fixed on the lower die base through the limiter, and the rotating device drives the concave die to rotate on the lower die base. Although the die can extrude the inner transverse rib in the inner cavity of the cylindrical part, the forming operation process is complicated, and the hardness of the blank is increased by lowering the temperature of the die and the temperature of the blank and needs to be heated for many times because the die only depends on a continuous upsetting method in the process of forming the inner transverse rib; the die contacts the surface of a blank under the rotary extrusion process and has the defects of large shearing force, large torque, large energy consumption and easy creasing. The downward pressure for forming the inner transverse rib is often more than 1000T, so the mould has the defects of complex forming operation process, low forming efficiency, easy creasing and large forming pressure.
Disclosure of Invention
The invention aims to solve the technical problems of complex forming operation process, low forming efficiency, easy crease and high forming pressure of the existing inner transverse rib extrusion die, and provides a die with a roller for spirally extruding an inner rib and a forming method thereof.
In order to solve the technical problems, the invention adopts the technical scheme that:
the utility model provides a take mould of crowded interior muscle of gyro wheel soon, its includes components of a whole that can function independently terrace die, last die, key, lower die, revolving stage, tray, psammitolite inside lining and steel ring inside lining, the tray is established in the bottom of die down and is located the tray hole that the revolving stage center set up and the tray surface passes through the feather key hookup with revolving stage tray hole, the bottom surface and the revolving stage of die are connected down, the underrun bolt of going up the die is connected with the top surface of die down, the key is established between last die bottom surface and lower die top surface and is located the keyway that sets up on last die bottom surface and the lower die top surface, the psammitolite inside lining dress is in the inner chamber of the good toper section of thick bamboo base of extruding, the steel ring inside lining is established at the periphery of inside lining up end.
Further, the components of a whole that can function independently terrace die comprises two monomer terrace dies, the monomer terrace die comprises die body, a plurality of duck egg shape gyro wheels, copper sheathing and baffle down, establish in the recess that the die body is close to the outside bottom surface setting a plurality of duck egg shape gyro wheel big heads outwards, contained angle between the duck egg shape gyro wheel is 30, the copper sheathing is established on the circle axle that duck egg shape gyro wheel both ends set up, baffle dress is close to on the bottom surface in the outside at the die body down and is fastened baffle and die body with fastening screw down, and the baffle bottom surface is 8 ~ 10mm apart from the distance of roll extrusion working face down.
Furthermore, the inner cavity of the upper female die is provided with eight vertical rib grooves.
Further, the steel ring inside lining is 6 ~ 8 lamellas.
A molding method of the mold with the roller for extruding the inner rib in a rotary manner comprises the molding steps:
1) reversely extruding the large cylindrical blank into a conical cylindrical blank by adopting a platform blank;
2) installing a die with a roller rotary extrusion inner rib on a rotary extrusion machine to enable a rotary table to be connected with an extrusion rotary power system of the rotary extrusion machine, installing a split male die on an upper die base, then placing a conical barrel blank into inner cavities of an upper female die and a lower female die, sequentially placing a sand core lining and a steel ring lining into the inner cavity of the conical barrel blank, and driving the split male die to move downwards to a groove-shaped position of the inner wall of a barrel under the action of a press machine sliding block in a combined state by the split male die;
3) the upper female die and the lower female die are driven by a rotary extrusion power system to rotate through a turntable, and meanwhile, the split male dies move and separate radially to extrude the inner wall of the conical barrel blank barrel body to reach the groove size and stop;
4) the upper female die and the lower female die continue to rotate at a constant angular speed through the turntable, the press machine slide block drives the separated split male die to move downwards at a speed of 0.5-1.5 mm/s, a duck egg-shaped roller arranged on the bottom surface of the split male die rolls the contacted inner wall material of the barrel body of the conical barrel blank in the downward moving process, and the inner wall material of the barrel body deforms between the steel ring lining and the groove shape and contracts inwards to form inner transverse ribs;
5) after the roller is rolled to form the inner transverse rib, the split male dies move radially and are combined, the press slide block moves upwards, the split male dies are taken away from the barrel, the tray moves upwards under the action of the extrusion and rotation machine ejector rod, the barrel with the sand core lining and the steel ring lining mixed core body is ejected out of the inner cavities of the upper female die and the lower female die, the sand core lining is broken after the barrel is air-cooled, the steel ring lining is divided into 8 segments and then taken out, and the process of extruding and rotating the inner rib is finished.
The invention has the beneficial effects that:
1. the sand core adopted in the casting process is used in the process of extruding and spinning the annular inner transverse bar, so that the inner transverse bar is formed to achieve the double purposes of forming and modifying. If the sand core is used for restraining blank forming, the material is greatly stressed under the solid-state flow condition to collapse the edges and corners of the sand core due to the influence of temperature and pressure, so that the corners of the lower end of the inner rib of the workpiece are folded; gravel on the sand core can be squeezed into the inner rib of the workpiece, so that slag inclusion defects are generated on the inner rib material, and the workpiece is scrapped. The sand core is covered by the steel ring lining, and the steel ring lining is divided into eight blocks, so that the sand core is not influenced in use and is convenient to take out, the collapse of the sand core is avoided, and the forming accuracy is improved.
2. The invention adopts the duck egg-shaped roller to meet the radial and axial working conditions of the split male die, and compared with the male die without the roller, the invention has the advantages of small axial downward pressure, small tonnage of a press machine, good die safety and no folding of materials. The flow line of the rib part is smooth and annular; the pressure for forming the inner transverse rib only needs about 200T.
3. The duck egg-shaped roller structure improves the efficiency of metal transfer to the center for the wide deformation of the blank, can continuously press down and roll, and overcomes the defects of complicated forming operation process caused by a continuous upsetting method in the process of forming the inner ribs without the rollers, and reduction of forming efficiency caused by that the hardness of the blank is increased for multiple times due to the reduction of the temperature of a die and the temperature of the blank.
4. The invention has wide application range. The optimization of the split male die and the forming process enables the application of the die to be more flexible, one-time heating can be carried out to complete the forming of one or more inner ribs in the same workpiece, and the demoulding is convenient and rapid. The invention is suitable forToEven larger barrel-type workpieces.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a bottom view of the split punch of the present invention;
FIG. 3 is a partial structural schematic view of the split male die of the present invention;
FIG. 4 is a schematic view of the split punch initial position of the present invention;
FIG. 5 is a schematic view of the split male die of the present invention descending to a groove position;
FIG. 6 is a schematic view of the split male die radial feed groove type forming of the present invention;
FIG. 7 is a schematic view of the split male die descending and duck egg-shaped roller for rolling and forming the inner ring rib;
FIG. 8 is a schematic view of the present invention showing the separation of the male mold ascending and the steel ring lining;
in the figure: 1-split male die, 2-upper female die, 3-key, 4-lower female die, 5-rotary table, 6-tray, 7-sand core lining, 8-steel ring lining, 9-sliding key, 10-extrusion power system, 11-male die body, 12-duck egg-shaped roller, 13-copper sleeve, 14-lower baffle, 15-fastening screw and 16-oil cylinder.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1, the mold with the roller for rotationally extruding the inner rib in the embodiment includes a split male mold 1, an upper female mold 2, a key 3, a lower female mold 4, a turntable 5, a tray 6, a sand core liner 7 and a steel ring liner 8, the tray 6 is arranged at the bottom of the lower female die 4 and is positioned in a tray hole arranged at the center of the turntable 5, the outer surface of the tray 6 is connected with the tray hole of the turntable 5 through a sliding key 9, the bottom surface of the lower concave die 4 is connected with the turntable 5, the bottom surface of the upper concave die 2 is connected with the top surface of the lower concave die 4 through bolts, the key 3 is arranged between the bottom surface of the upper female die 2 and the top surface of the lower female die 4 and is positioned in a key groove arranged on the bottom surface of the upper female die 2 and the top surface of the lower female die 4, the sand core lining 7 is arranged in an inner cavity of the extruded conical barrel blank, the steel ring lining is arranged on the periphery of the upper end face of the sand core lining 7, and the split male die 1 is arranged on the upper die base.
As shown in fig. 1-3, components of a whole that can function independently terrace die 1 comprises two monomer terrace dies, the monomer terrace die comprises die body 11, a plurality of duck egg shape gyro wheel 12, copper sheathing 13 and baffle 14 down, a plurality of duck egg shape gyro wheels 12 big head are established outwards in the recess that die body 11 is close to the outside bottom surface setting, the contained angle between duck egg shape gyro wheel 12 is 30, copper sheathing 13 is established on the circle axle that duck egg shape gyro wheel 12 both ends set up, baffle 14 dress is on the bottom surface that die body 11 is close to the outside and is fastened baffle 14 and die body 11 down with fastening screw 15 down on, and the distance of baffle 14 bottom surface apart from the roll extrusion working face down is 8 ~ 10 mm.
Furthermore, eight vertical rib grooves are formed in the inner cavity of the upper female die 2.
Further, steel ring inside lining 8 is 6 ~ 8 lamellas.
As shown in fig. 1 and 4 to 8, in the molding method of the mold with the roller for extruding the inner rib, the molding steps are as follows:
1) reversely extruding the large cylindrical blank into a conical cylindrical blank by adopting a platform blank;
2) installing a die with a roller rotary extrusion inner rib on a rotary extrusion machine to enable a rotary table 5 to be connected with a rotary extrusion power system 10 of the rotary extrusion machine, installing a split male die 1 on an upper die base, then placing a conical barrel blank into inner cavities of an upper female die 2 and a lower female die 4, sequentially placing a sand core lining 7 and a steel ring lining 8 into the inner cavity of the conical barrel blank, and driving the split male die 1 to move downwards to a groove-shaped position of the inner wall of a barrel body under the action of a press machine slide block in a combined state by the split male die 1;
3) the upper female die 2 and the lower female die 4 are driven by a rotary extrusion power system to rotate through the turntable 5, and meanwhile, the split male die 1 moves and separates radially under the action of the oil cylinder 16 to extrude the inner wall of the conical barrel blank barrel body to reach the groove size and stop;
4) the upper female die 2 and the lower female die 4 continue to rotate at a constant angular speed through the rotary table 5, the press machine slide block drives the separated split male die 1 to move downwards at a speed of 0.5-1.5 mm/s, a duck egg-shaped roller 12 arranged at the bottom surface of the split male die 1 rolls and rolls the contacted conical barrel blank barrel inner wall material in the downward moving process, and the barrel inner wall material deforms between the steel ring lining 8 and the groove shape and contracts inwards to form inner transverse ribs; the rolling process can upset and roll the lower material, and because the steel ring lining 8, the sand core lining 7 and the like are restrained by the core body, the upper female die 2 and the lower female die 4 and cannot deform, the inner wall material of the cylinder body can only deform between the steel ring lining 8 and the groove shape to form an inner transverse rib;
5) after the roller is rolled to form the inner transverse rib, the split male dies 1 move radially under the action of the oil cylinder 16 and are combined, the press slide block moves upwards to take the split male dies 1 away from the barrel, the tray 6 moves upwards under the action of the extrusion and rotation machine ejector rod, the barrel is ejected out from the inner cavities of the upper female die 2 and the lower female die 4 together with the mixed core body of the sand core lining 7 and the steel ring lining 8, the sand core lining 7 is broken after the barrel is cooled in air, the steel ring lining 8 is divided into 8 sections and then taken out, and the process of extruding and rotating the inner rib is finished.

Claims (5)

1. The utility model provides a take mould of muscle in gyro wheel crowded soon which characterized in that: comprises a split male die (1), an upper female die (2), a key (3), a lower female die (4), a turntable (5), a tray (6), a sand core lining (7) and a steel ring lining (8), wherein the tray (6) is arranged at the bottom of the lower female die (4) and is positioned in a tray hole arranged at the center of the turntable (5), the outer surface of the tray (6) is connected with the tray hole of the turntable (5) through a sliding key (9), the bottom surface of the lower female die (4) is connected with the turntable (5), the bottom surface of the upper female die (2) is connected with the top surface of the lower female die (4) through a bolt, the key (3) is arranged between the bottom surface of the upper female die (2) and the top surface of the lower female die (4) and is positioned in a key groove arranged on the bottom surface of the upper female die (2) and the top surface of the lower female die (4), the sand core lining (7) is arranged in an inner cavity of an extruded conical barrel blank, and the, the split male die (1) is arranged on the upper die base.
2. The mold with the roller for extruding the inner rib in the spinning way as claimed in claim 1, wherein: components of a whole that can function independently terrace die (1) comprises two monomer terrace dies, the monomer terrace die comprises die body (11), a plurality of duck egg shape gyro wheel (12), copper sheathing (13) and baffle (14) down, establish in the recess that die body (11) are close to the outside bottom surface setting outward a plurality of duck egg shape gyro wheel (12) big head, contained angle between duck egg shape gyro wheel (12) is 30, establish in the circle that duck egg shape gyro wheel (12) both ends set up epaxially in copper sheathing (13), baffle (14) dress is on the bottom surface that die body (11) are close to the outside and is fastened baffle (14) and die body (11) down with fastening screw (15), and baffle (14) bottom surface is 8 ~ 10mm apart from the distance of roll extrusion working face down.
3. The mold with the roller for extruding the inner rib in the spinning way as claimed in claim 1, wherein: and eight vertical rib grooves are formed in the inner cavity of the upper female die (2).
4. The mold with the roller for extruding the inner rib in the spinning way as claimed in claim 1, wherein: the steel ring lining (8) is 6-8 petals.
5. A forming method of the die with the roller for spinning the inner rib according to any one of claims 1 to 4, characterized in that the forming step is as follows:
1) reversely extruding the large cylindrical blank into a conical cylindrical blank by adopting a platform blank;
2) the die with the roller rotary extrusion inner rib is arranged on a rotary extrusion machine, so that a rotary table (5) is connected with a rotary extrusion power system (10) of the rotary extrusion machine, a split male die (1) is arranged on an upper die base, then a conical barrel blank is placed into inner cavities of an upper female die (2) and a lower female die (4), a sand core lining (7) and a steel ring lining (8) are sequentially placed into the inner cavity of the conical barrel blank, and the split male die (1) drives the split male die (1) to move downwards to a groove-shaped position of the inner wall of a barrel under the action of a press machine slide block in a combined state;
3) the upper female die (2) and the lower female die (4) are driven by a rotary extrusion power system to rotate through a turntable (5), and meanwhile, the split male dies (1) move and separate in the radial direction, and the inner wall of the extruded conical barrel blank barrel body reaches the groove size and stops;
4) the upper female die (2) and the lower female die (4) continue to rotate at a constant angular speed through the rotary table (5), the press slide block drives the separated split male die (1) to move downwards at a speed of 0.5-1.5 mm/s, a duck egg-shaped roller (12) arranged at the bottom surface of the split male die (1) rolls and rolls the contacted conical barrel blank barrel inner wall material in the downward moving process, and the barrel inner wall material deforms between a steel ring lining (8) and a groove type and contracts inwards to form an inner transverse rib;
5) after the roller is rolled to form the inner transverse rib, the split male dies (1) move radially and are combined, the press machine slide block moves upwards, the split male dies (1) are separated from the barrel, the tray (6) moves upwards under the action of the extrusion and rotation machine ejector rod, the barrel is ejected out from the inner cavities of the upper female die (2) and the lower female die (4) together with the mixed core body of the sand core lining (7) and the steel ring lining (8), the sand core lining (7) is broken after the barrel is cooled by air, the steel ring lining (8) is divided into 8 sections and then taken out, and the extrusion and rotation process of the inner rib is finished.
CN201811627664.5A 2018-12-28 2018-12-28 Mold with roller for rotationally extruding inner ribs and forming method of mold Active CN109465308B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811627664.5A CN109465308B (en) 2018-12-28 2018-12-28 Mold with roller for rotationally extruding inner ribs and forming method of mold

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811627664.5A CN109465308B (en) 2018-12-28 2018-12-28 Mold with roller for rotationally extruding inner ribs and forming method of mold

Publications (2)

Publication Number Publication Date
CN109465308A CN109465308A (en) 2019-03-15
CN109465308B true CN109465308B (en) 2020-06-09

Family

ID=65677719

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811627664.5A Active CN109465308B (en) 2018-12-28 2018-12-28 Mold with roller for rotationally extruding inner ribs and forming method of mold

Country Status (1)

Country Link
CN (1) CN109465308B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110328251B (en) * 2019-06-21 2020-09-01 武汉理工大学 Near-net composite flow forming device and method for annular component with outer ribs

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5884610A (en) * 1981-11-13 1983-05-20 Machiyama Seisakusho:Kk Forming of metallic vessel
CN103567248B (en) * 2013-10-21 2016-01-06 中北大学 A kind of inside and outside compromise face band muscle cylinder extrusion molding dies
CN106424188B (en) * 2016-09-01 2018-02-02 中北大学 Hollow blank shapes the rotary extradition forming die of large ratio of height to width inner ring muscle
CN108687152B (en) * 2018-05-03 2019-11-01 燕山大学 A kind of two-way point of mould rotary extradition forming die of inner ring muscle and die sinking method

Also Published As

Publication number Publication date
CN109465308A (en) 2019-03-15

Similar Documents

Publication Publication Date Title
US4055976A (en) Method of roller spinning cup-shaped metal blanks and roller construction therefor
CN1187178C (en) Process for manufacture of shaped articles
EP1655089B1 (en) Method of producing a wheel
US10265746B2 (en) Rotary extrusion producing method for producing inner ring rib with large aspect ratio formed of hollow billet
CN100475429C (en) A labor-saving automobile hub forming method and device thereof
CN102601587B (en) Manufacturing process of aluminum alloy rim of large vehicle
CN104107897B (en) The squeeze casting mould of straight tooth column metal gear and casting method thereof
CN103567248B (en) A kind of inside and outside compromise face band muscle cylinder extrusion molding dies
CN100441369C (en) Directional axial conical standpipe process of motorcycle by disposable cold extruding formative machining
CN101234401B (en) Magnesium alloy automobile wheel extrusion molding method and mold
CN201389572Y (en) Pipe cold extrusion reducing device
RU2526348C2 (en) Method and device for rotary extrusion with wall thinning
CN202137312U (en) Cold-extrusion die for output spline shaft of automobile automatic transmission
KR20100022448A (en) Method and device for manufacturing fastenings and fasteners with radial outer contours, especially screws or threaded bolts
CN101332476B (en) Precise extrusion molding method of thin wall long-pipe shaped parts bland and special mould
KR100287222B1 (en) Rotary Forging Device
CN103341515B (en) Extrusion forming mould for annular ribs of magnesium alloy shell parts
CN106216538A (en) A kind of major diameter ring mechanical expansion equipment
CN101708526B (en) Method and die for forming driven helical gear profile of automobile rear axle
CN101474642B (en) Multiway shaping method of magnesium alloy wheel and mold
CN101829698A (en) Extrusion forming process of thin-wall long pipe-shaped part blank with flange and mould
CN104588552B (en) Spline hub tooth profile forming device and spline hub tooth profile forming process
US10543717B2 (en) Variable-wall light-weight axle shaft with an integral flange member and method for making the same
CN105344735B (en) A kind of cold extrusion molding mould and moulding process of the output shaft with endoporus
CN103831390A (en) Cold heading forming method of car sleeve and mould structure for sleeve forming

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant